Automatic focusing system including quantizing means

Details Automatic focusing system including quantizing means Automatic focusing system including quantizing means

1974-04-29

1977-03-15

McGraw, Vincent P.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

235151, 356125, 356 39, G01J 120

Patent

active

040126340

ABSTRACT:
An automatic focusing system is provided for a microscopic instrument having a lens assembly and a platform for supporting an object. The system includes a flying spot scanner, the light from which is directed through the lens assembly at the object. The system includes means responsive to the light directed at the object for generating a signal representative of the color density of the object. The system includes electronic circuitry responsive to the signals and connected to the microscopic instrument for changing the focus of the instrument. The electronic means which are responsive to the signal change the focus of the instrument a plurality of times and includes decision means responsive to the signal for determining the optimum focus and moving the instrument to the optimum focus. The circuitry includes quantization means responsive to the signal which effectively determines the focus position which provides the sharpest resolution of the object examined by the microscopic instrument.

REFERENCES:
patent: 2363409 (1944-11-01), Gibson
patent: 3652164 (1972-03-01), Faramarzpour et al.
patent: 3783269 (1974-01-01), McConnell
patent: 3806257 (1974-04-01), Amos
patent: 3824393 (1974-07-01), Brain
patent: 3827804 (1974-08-01), Miller et al.
patent: 3846629 (1974-11-01), Stauffer
patent: 3883689 (1975-05-01), Mansour et al.
patent: 3932733 (1976-01-01), Olsen et al.

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